PDF malware analysis — malicious · 67f7c0060edffa23

MALICIOUS

PDF

39.4 KB Created: 2020-08-19 13:41:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 81ee5198866b8cc075a6585d15d9007a SHA-1: 5381d819cb81a49937cb384899ad9037299881e6 SHA-256: 67f7c0060edffa2316f88bae925e882b8226a85e57cc28c4dbe978976af1ae81

162 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a malicious redirector link disguised as a download for Adobe Acrobat Reader. The document body and embedded link structures suggest a phishing attempt to trick users into downloading malware. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK

PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM

Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON

Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL

The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL https://ttraff.ru/pify?keyword=adobe+acrobat+reader+2019+free
- http://files.skylineelectricmn.com/uploads/1/3/2/6/132682134/rasokisaxiwum_nivawosanofiz.pdf
- http://tidowij.jonathanrudy.com/uploads/1/3/1/8/131857152/3326981.pdf
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://cdn.shopify.com/s/files/1/0438/5737/9488/files/21518180512.pdf
- https://cdn.shopify.com/s/files/1/0431/9775/9643/files/306660031.pdf
- https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gowaluzefep.pdf
- https://cdn.shopify.com/s/files/1/0427/9812/1119/files/ansys_workbench_book_download.pdf
- https://cdn.shopify.com/s/files/1/0438/1966/3522/files/autumn_leaves_piano_sheet_music_eva_cassidy.pdf
- https://cdn.shopify.com/s/files/1/0430/6737/5770/files/zupexotavidowudasanu.pdf
- https://cdn.shopify.com/s/files/1/0430/7373/2768/files/32400650478.pdf
- http://www.w3.org/1999/02/22-rdf-syntax-ns#
- http://purl.org/dc/elements/1.1/
- http://ns.adobe.com/pdf/1.3/
- http://ns.adobe.com/xap/1.0/
- http://ns.adobe.com/xap/1.0/mm/
- http://ns.adobe.com/xap/1.0/rights/
- http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00005b3d.bin` `c6c2b7f69dc4ca5e930289085ecb90e76644e8e1ca0bf1b8967bccd3464b3f8c`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5B3D	5416 bytes
`font_01_sfnt_off00006dbc.bin` `e96a4979ea6f60b405d424d7155c30429361021f9907cdb55ef6adf97a361b8a`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6DBC	10388 bytes

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